Tie for concrete form work



@am L1935.. E. P. MUNTZ M9137 TIE FOR CONCRETE FORM WORK Filed sept'. 18, 1955 j 5 /Zi lnuantmrf CII Patented Oct. 1, 1935 UNITED STATES PATENT OFFICE TIE FOR CONCRETE FORM WORK Eric Percival Muntz, Hamilton, Ontario, Canada Application September 18, 1933, Serial No. 689,940

1 Claim. (Cl. 24-126) My invention relates to the tying of concrete form work by the use of wires and clamps as disclosed in my United States Patent No. 1,910,121, of May 23rd, i933, and the object of my present invention is to provide a button or head which is adapted to be secured upon the end of the wire opposite to the clamp-receiving end and to engage the form panel structure.

A further and essential object of my invention is to so secure the button or head upon the wire that there is no possibility of slippage and at the same time avoid impairing the ultimate strength of the wire at the point of thev buttons engagement.

Another object of my invention is to so construct the button that it will remain secure upon the wire through repeated uses and at the same time be capable of being manually removed without destruction, if it is desired to`replace the wire.

My invention consists of a form tie of the character set forth all as hereinafter more particularly described and illustrated in the accompanying drawing in which:

Fig. l. is an end elevational view of my head, or button, mounted upon the end of a length of Wire.

Fig. 2 is a longitudinal cross sectional view through the head.

Fig. 3 is a perspective view of my head before it is positioned upon the wire, the gripping jaws therein being removed.

Fig. e is a cross sectional View through a fragmentary portion of concrete form work showing a pair of side panel structures and my tie extending thereacross, and

Fig. is a side elevational View of a clamp used for tightening my head or button upon the wire, the button and a fragmentary portion of the clamp being shown in section.

Like characters of reference indicate corresponding parts in the different views in the drawing.

The head or button comprises a substantially cylindrical housing I having a wire receiving orioe 2 extending centrally therethrough and a plurality of jaw containing grooves 3 positioned radially of the orifice l and opening thereinto. The grooves 3 are preferably equidistantly spaced apart and formed with ilat side faces and bottoms, the bottom faces 4 being uniformly inclined in respect to the longitudinal axis of the orifice 2.

The grooves 3 each contain a wedge-shaped jaw 5, such jaws being slidably contained within the grooves 3 and adapted to engage the wire 6 in the orifice 2. The wedge-shaped jaws 5 are, of course, so positioned within the grooves 3 that their serrated concave wire engaging faces 'l lie parallel to each other and engage the Wire with 5 a uniform pressure.

When inserting the end of the wire 6 into the head, the jaws 5 are moved to the left hand end of the housing, as illustrated in Fig. 2, wherein the Wire engaging faces yof the jaws move 10 apart permitting the free entry of the wire from the right hand end of the head. When the wire is inserted it is pulled in the opposite direction to the direction of insertion wherein the jaws 5 slide with the wire andthrough their engagement carrying a turning handle I8 upon the outer 25 end thereof. The inner end of the screw Il carries a freely mounted ferrule I9 which is adapted to bear against the end of an inserted Wire 6. The yother' leg of the clamp is formed with a slot 29 for the reception of a button carrying Wire, the button resting against the inner face of the leg. After the button is secured upon the wire ii the wire and button are inserted into the clamp as shown in Fig. 5 and the screw l1 tightened down wherein the ferrule bears against the end of the wire E to push it outwardly whereby the jaws 5 slide a slight degree in their inclined grooves with the wire and attain a maximum wedge action.

As the form tie is generally exposed to the weather and as both the wire and jaws are made of steel, I nd it desirable to shield the jaws and contained wire portion against the entry of moisture or other foreign matter into the housing, and to do this I form the end faces 8 and 9 of the housing with cup recesses I0 into which I pour molten lead or some other suitable sealing material wherein such seal covers the ends of the jaws and also the contained end of the wire.

In Fig. 4, I show a pair of form panel structures ll and l2 with my wire E extending therebetween, the head housing l being positioned upon one protruding end of the wire and a clamp I3, such as described in my United States Patent No. 1,910,121, positioned upon the other end of the wire and adjustably engaging the walings I4 of the form panel structure. As my wire and its head or button must withstand the outward pressure of the form panel structure under the weight of the poured concrete, it is essential that the head be positively secured to the wire and that the ultimate strength of the wire be retained in the portion of Wire contained within the head. Through a series of extensive experiments I have evolved my construction as shown herein which I have foundto meet all tensional requirements. When the concrete is partially set or green, the tension on the wire 6 is released, and the wire given a partial twist to break its bond with the concrete, by the application of a Spanner upon the flat sides l5 on the housing I.

If it is desired at any time to replace the Wire, the head'can be removed from the old piece of Wire by driving the housing 'l inwardly upon the wire wherein the jaws initially remain stationary when the casing is driven and thus become loose and at the same time force the seal partially out of the cup as such seal is, of course, bearing against the ends of the jaws. When the jaws besome loose the wire can be readily removed from the housing,

Although I have shown a particular and preferred embodiment vof my invention, it is to be 5 through and a plurality of jaW containing grooves 15- having flat sides and bottoms positioned radially of the orice and opening thereinto, the bottom faces of the grooves being inclined in respect to Y the longitudinal axis of the orifice, and a plurality of flat sided wedge shaped wire engaging 20 jaws totally contained Within the housing and positioned within the grooves and resting upon the groove bottoms.

ERIC PERCIVAL MUNTZ. 

